123012020221 has 4 divisors (see below), whose sum is σ = 123023606272. Its totient is φ = 123000434172.

The previous prime is 123012020161. The next prime is 123012020227. The reversal of 123012020221 is 122020210321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122020210321 = 2213 ⋅55137917.

It is a cyclic number.

It is not a de Polignac number, because 123012020221 - 2²³ = 123003631613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123012020195 and 123012020204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123012020227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5777085 + ... + 5798338.

It is an arithmetic number, because the mean of its divisors is an integer number (30755901568).

Almost surely, 2^123012020221 is an apocalyptic number.

It is an amenable number.

123012020221 is a deficient number, since it is larger than the sum of its proper divisors (11586051).

123012020221 is a wasteful number, since it uses less digits than its factorization.

123012020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11586050.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 123012020221 its reverse (122020210321), we get a palindrome (245032230542).

The spelling of 123012020221 in words is "one hundred twenty-three billion, twelve million, twenty thousand, two hundred twenty-one".